The Dublo Architecture Pattern for Smooth Migration of Business Information Systems: An Experience Report

  • Authors:

  • Wilhelm Hasselbring;Ralf Reussner;Holger Jaekel;Jurgen Schlegelmilch;Thorsten Teschke;Stefan Krieghoff

  • Affiliations:

  • University of Oldenburg;University of Oldenburg;OFFIS;OFFIS;OFFIS;KDO

  • Venue:
  • Proceedings of the 26th International Conference on Software Engineering
  • Year:
  • 2004

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Abstract

While the importance of multi-tier architectures for enterpriseinformation systems is widely accepted and theirbenefits are well published, the systematic migration frommonolithic legacy systems toward multi-tier architectures isknown to a much lesser extent. In this paper we present apattern on how to re-use elements of legacy systems withinmulti-tier architectures, which also allows for a smooth migrationpath. We report on experience we made with migratingexisting municipal information systems towards a multitierarchitecture. The experience is generalized by describingthe underlying pattern such that it can be re-used forsimilar architectural migration tasks. The emerged Dublopattern is based on the partial duplication of businesslogic among legacy system and newly deployed applicationserver. While this somehow contradicts the separation-of-concernsprinciple, it offers a high degree of flexibility inthe migration process and allows for a smooth transition.Experience with the combination of outdated databasetechnology with modern server-side component and webservices technologies is discussed. In this context, we alsoreport on technology and architecture selection processes.